<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">

<title>数组去重</title>
  <script>
   //    去掉一个数组的重复元素
   var arr = [1, 2, 3, 4, 5, 2, 3, 4];
   var newArr = [];
   for (var i = 0; i < arr.length; i++) {
    var bool = true;
    //每次都要判断新数组中是否有旧数组中的值。
    for (var j = 0; j < newArr.length; j++) {
     if (arr[i] === newArr[j]) {
      bool = false;
     }
    }
    if (bool) {
     newArr[newArr.length] = arr[i];
    }
   }
   console.log(newArr);
  </script>
 </head>
 <body>
  <h1>数组去重</h1>
 </body>
</html>
